Thomas e



(No Model.) i

T. R. WEIGHT 8v T. B. HILL.

TRIMMING- ATTACHMENT FOR SEWING MACHINES.

No. 257,124. Patented A131225, 1882. PQ /f' v e@ F1 Il A @u A w llll u pq* lllilllll N. PETERS. Phvmuthngmphnr. washington. D. C.

UNITED STATI-Es PATENT OFFICE.

THOMAS B. VRIGHT AND THOMAS B. HILL, OF PHILADELPHIA, PA.

TRVIIVIINGATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N o. 257,124, dated April 25, 1882.

Application filed July 8, 1881. (No model.)

To all whom t may concern:

Be it known that we, TnoMAs R. WRIGHT and THOMAS B. HILL, of Philadelphia, county ot' Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Trimming Attachments for Sewing-Machines, of which the following is a specification.

The object of our invention is a simple and effective sewing-machine which, while being operated, will trim the edges of the fabrics being sewe'd, and this object we attain in a manner too well described hereinafter to need preliminary description.

Our invention is shown in the accompanying drawings, in which Figure lis a front view, partly in section, of sufficient ofa sewing-machine to illustrate our improvement. Fig. 2 is a sectional end view ofthe same. Fig. 3 is an enlarged sectional view ot' that part of the machine to which our invention relates, and Figs. 4 and 5 are detached enlarged sectional views.

A is the frame of the machine; B, the driving-shaft, G the feed mechanism, D the threadhoolr, B the bed-plate, F the arm, G the needlebar, and H the presser-foot7 ofthe sewing-machine. I

The driving-shaft B has a bearing in the frame A beneath the bed-plate E. Secured to the shaft, or forming part of the same, is an eccentric, a, for operating the feed mechanism O. Adjacent to the said eccentric is the hook 1), a stud, b, of which eut-ers into and is secured within the eccentric. Between the eccentric c and hook D, upon the stud b, is the thread-guide c. The thread-guide c we make in the shape of a short arm or cutter, c', which by the revolution of the drivin g-shaft to operate the feed mechanism and needlearmis caused to rotate and project at intervals through a slot made in the base-plate for the passage of the same. The end of the arm or cutter c', or that part which projects up above the bed-plate in its revolution, we form into a sharp cutting-edge. A short distance from the end of the cutter-arm c ,beneath the bed-plate, the said arm is bent, (see Fig. 3,) so as to bring it close to the needle.

It will be evident that the length of the bent portion will'be according to the desiredwidth of the projecting ends of the seam.`

The thread-guide c or cutter c is secured to the thread-hook in the present instance by means of a screw, d. (See Fig. et.)

In the presser-foot H we make a groove, e, for the passage ofthe cutter-arm, (see Figs. 2 and 3,) which groove allows of the free passage ofthe cutter-arm, but serves as a shield for the same to prevent any accident by the cutter-arm to the operators ngers.

In Fig. 5 is shown another mode of securing 'the cutter-arm c to the driving-shaft B. 1n said figure, D is the thread-hook, O the ordinary thread-guide, and c the eccentric. The cutter c' on the stud b is secured by means oi' the screwA d to the eccentric a.

It will be evident that by securing the cutter c to either the thread-hook or eccentric the rotation of the cutter with the drivingshaft is secured. The cutter turns freely without contact in the slot in the bed-plate, and also in the groove in the presser-foot H. By the revolution of the shaft, and consequently the cutter c', the cutting-edge of the cutter is caused to project above and move along the surface of the bed-plate, trimming the seam of the fabric being sewed.

By securing the cutter cto the driving-shaft beneath the bedplate the bed-plate is unobstructed, allowing of the free movement of the material being operated ou upon the bed-plate, and liability of damage to the operators hands is avoided.

'Vhat we claim as our invention isl. The combination, with the main drivingshaft B, located beneath the bed-plate of the machine, of the cutter c', secured to said shaft and adapted to project upward through a slot in said bed-plate into the grooved presserfoot, substantially as described.

2. The combination, with the driving-shaft B and cutter c', of the presser-foot H, provided with the groove c, for the purpose specified.

In testimony whereof we have signed our names to this specitication in the presence of 9 5 two subscribing witnesses.

T. R. IVRIGHI. TI-IOS. B. HILL. 

